require 'commander/blank'
require 'commander/command'

module Analytics
  module Command
    # A class that's called from CLI's 'generate' argument,
    # and used to generate analytics files from the resource JSON file.
    class Generate
      include Helpers::Terminal

      def perform
        unless File.file?(config_src_path)
          prompt.error("Unable to find #{config_src_path}")
          return
        end
        prompt.say('Generating analytics files...')
        generate
        prompt.ok('Analytics files are successfully generated!')
      end

      ## The following methods are used to generate analytics files,
      ## based on settings defined in 'analytics.yml' configuration file.

      private

      ## Retrieving values from configuration file.

      def config
        Analytics::IO::Config.read
      end

      def config_lang
        config[:language]
      end

      def config_analytics_path
        config[:analyticsFilesPath]
      end

      def config_src_path
        config[:sourcePath]
      end

      ## Generating

      def generate
        json_file = File.open(config_src_path)
        json_src = JSON.load(json_file)

        case config_lang
        when 'swift'
          FileUtils.mkdir_p config_analytics_path unless File.exist? config_analytics_path
          Analytics::Serializer::Swift.new(json_src).save(config_analytics_path)
        when 'objc'
          FileUtils.mkdir_p config_analytics_path unless File.exist? config_analytics_path
          Analytics::Serializer::ObjC.new(json_src).save(config_analytics_path)
        when 'swift-objc'
          
          swift_path = config_analytics_path + '/Swift'
          objc_path = config_analytics_path + '/ObjC'

          FileUtils.mkdir_p swift_path unless File.exist? swift_path
          FileUtils.mkdir_p objc_path unless File.exist? objc_path

          Analytics::Serializer::Swift.new(json_src).save(swift_path)
          Analytics::Serializer::ObjC.new(json_src).save(objc_path)
        else
          prompt.error("Unsupported value '#{config_lang}' for 'language'. Supported values are:\n"\
          "- 'swift' - if You're using only Swift in Your project,\n"\
          "- 'objc' - if You're using only ObjC in Your project,\n"\
          "- 'swift-objc' if You're using both Swift & ObjC in Your project.")
          return
        end
      end
    end
  end
end